Abstract
Purpose
While most examples of nanoparticle therapeutics have involved parenteral or IV administration, pulmonary delivery is an attractive alternative, especially to target and treat local infections and diseases of the lungs. We describe a successful dry powder formulation which is capable of delivering nanoparticles to the lungs with good aerosolization properties, high loadings of nanoparticles, and limited irreversible aggregation.
Methods
Aerosolizable mannitol carrier particles that encapsulate nanoparticles with dense PEG coatings were prepared by a combination of ultrasonic atomization and spray freeze drying. This process was contrasted to particle formation by conventional spray drying.
Results
Spray freeze drying a solution of nanoparticles and mannitol (2 wt% solids) resulted in particles with an average diameter of 21 ± 1.7 μm, regardless of the fraction of nanoparticles loaded (0–50% of total solids). Spray freeze dried (SFD) powders with a 50% nanoparticle loading had a fine particle fraction (FPF) of 60%. After formulation in a mannitol matrix, nanoparticles redispersed in water to < 1 μm with hand agitation and to < 250 nm with the aid of sonication. Powder production by spray drying was less successful, with low powder yields and extensive, irreversible aggregation of nanoparticles evident upon rehydration.
Conclusions
This study reveals the unique advantages of processing by ultrasonic spray freeze drying to produce aerosol dry powders with controlled properties for the delivery of therapeutic nanoparticles to the lungs.
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Abbreviations
- da :
-
Aerodynamic diameter
- DPI:
-
Dry powder inhaler
- EtTP-5:
-
2,2,10,10-tetraethyl-6,14-bis (triisopropylsilylethynyl)- 1,3,9,11-tetraoxadicyclopenta [b,m] pentacene fluorescent dye
- FPF:
-
Fine particle fraction
- LN2:
-
Liquid nitrogen
- NGI:
-
Next generation impactor
- NP:
-
Nanoparticle
- NPAC:
-
NP aerosol carriers
- PLA3.8k-b-PEG5k-OCH3 :
-
Polylactide-b-poly(ethylene glycol)
- PSD:
-
Particle size distribution
- PVA:
-
Polyvinyl alcohol
- SD:
-
Spray dry
- SFD:
-
Spray freeze dry
- THF:
-
Tetrahydrofuran
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Acknowledgments And Disclosures
This work made use of the Confocal & Electron Microscopy Core Facility at Princeton University and the authors acknowledge Joe Goodhouse for expert help with confocal microscopy. This work was supported through National Science Foundation and the Australian Academy of Science as part of the East Asia and South Pacific Summer Institutes Fellowship (1015344) and through grants from the Australian Research Council (DP0985367 & 120102778).
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D’Addio, S.M., Chan, J.G.Y., Kwok, P.C.L. et al. Aerosol Delivery of Nanoparticles in Uniform Mannitol Carriers Formulated by Ultrasonic Spray Freeze Drying. Pharm Res 30, 2891–2901 (2013). https://doi.org/10.1007/s11095-013-1120-6
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DOI: https://doi.org/10.1007/s11095-013-1120-6